Anchor-bushing for screws, &amp;c.



No. 697,896. Patented Apr. I5, 1902.

w. s. SMITH.

ANCHOR BUSHING FOR scnEws, &c.

{Application filed Nov. 21, 1901.]

(No Model.)

R w M NN My NH Nm NN UNirnn Smarts PATENT OFFICE.

WILLIAM S. SMITH, OF SPRINGFIELD, MASSACHUSETTS.

ANCHOR-BUSHING FOR SCREWS, C.

SPECIFICATION forming part of Letters Patent No. 697,896, dated April15, 1902.

Application filed November 21, 1901. Serial No. 83,112. (No model.)

To all whom, it may concern:

Be it known that I, WILLIAM S. SMITH, a citizen of the United States ofAmerica, residing at Springfield, in the county of I-Iampden and Stateof Massachusetts, have invented new and useful Improvements in Anchor-Bushings for Screws, &c., of which the following is a specification.

This invention relates to anchor-bolt bushlugs for the securing ofobjects against a support which is composed of some material into whicha bolt cannot be screwed; and the object of this invention is to make abushing of this character into which may be screwed a lag-screw or boltwhich by the act of its entrance will eXpand the bushing sufficiently tobind it tightly in the hole made to receive it.

A further object of the invention is to provide a bushing which shallexpand equally from one end thereof to the other; and having these endsin view the invention consists in the construction fully described inthe following specification and clearly summarized in the claimsappended thereto.

In the drawings forming part of this application, Figure 1 is asectional elevation of a part of a wall, showing the mode of applicationof my invention. Fig. 2 is a cross-sectional View on line 2 2, Fig. 1.Fig. 3 is a perspective view of a bushing constructed according to myinvention. Fig. 4 illustrates another application of the invention. Fig.5 is a side elevation of a bushing tapered exteriorly from one end tothe other.

In carrying my invention into practice 1 construct a bushing a,preferably cylindrical in form and having a cylindrical bore 1)therethrough. This bushing is preferably made of some metal which willreadily take the threads of a lag-screw c orbolt when the latter isscrewed into it, and I have found that lead stiffened by the additionthereto of some harder metal, as tin or antimony, best serves for thispurpose. To permit the equal expansion of the bushing when a lag-screwis entered therein, saw-cuts (Z are made diametrically therethrough, oneof said cuts extending from one end toward the other and for somedistance past the longitudinal center of the bushing and the other outbeing located in a plane at right angles to the first and extending fromthe opposite end for an equal distance toward that end which is dividedby the first saw-cut. This permits the even expansion of the bolt fromone end to the other. The interior bore of the bushing has a diametersubstantially equal to that of the bolt or the screw 0 at the bottom ofthe threads, and the external diameter of the bushing is as much smallerthan the hole in the wall 6 as will permit it to be easilypushed intosaid hole, and yet fitting sufficiently close therein to tightly fill itwhen the screw 0 is entered in the bushing.

In some cases it may be desirable to provide a tapered bushing, such asis shown in Fig. 5, which may be expanded in an inwardly-t-apering hole,where an unusually secure anchorage is required. In this case only theexternal dimension of the bushing is varied, it being slightly taperedfrom one end to the other; but the bore of the bushing will in all casesbe cylindrical.

Fig. t shows one of the many useful applications of this invention,wherein the bushing is adapted to receive a small screw for securing ametal clip f to the under side of the marble top g of a set-bowl h, insecuring which heretofore it has been necessary to anchor a bolt in ahole in the top 9 by means of plasterof-paris or lead, which bolt has athreaded outer end, to which a nut is applied to hold the clip in place.My construction provides a much cheaper and more secure fastening.

Having thus described my invention, What I claim, and desire to secureby Letters Patent of the United States, is-

1. An anchor-bushing for screws consisting of a cylinder of metaladapted to receive the threads of a screw, said bushing having acylindrical hole therethrough of less diameter than a screw for enteringit, there being sawcuts extending diametrically through said bushingfrom each end toward the opposite end, and located in planes at an angleone to the other.

2. An anchor-bushing for screws consisting of a cylinder of metaladapted to receive the threads of a screw, said bushing having acylindrical hole therethrough of less diameter than ascrew for enteringit, there being sawcuts extending diametrically through said bushingfrom each end toward the opposite end, and each extending past the otherin planes at an angle to each other.

WILLIAM S. SMITH.

